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Engine Stalls While Driving Or Idling

An engine that cuts out can have fuel delivery problems, a failing crankshaft sensor, idle control faults or electrical supply problems.

High risk

Stalling in traffic is a safety risk: steering and braking get heavier. Have it checked promptly.

Short answer · Why does my engine stall?

Note when it stalls. Stalling when coming to a stop points to idle control, air leaks or the air flow sensor. Stalling while driving, especially when warm, points to the crankshaft sensor, fuel pump or electrical supply. Read the fault codes and avoid busy roads until it is fixed.

On this page

Safe checks you can do

  1. Note when it stallsAt stops, while driving, when cold or warm.
  2. Read fault codesCrank sensor, fuel pressure or idle codes help.
  3. Check the fuel gaugeA faulty gauge can hide an empty tank.

Questions that narrow it down

  1. Does it stall when stopping?Idle control or air leaks.
  2. Does it stall when hot?Crankshaft sensor or fuel pump.
  3. Do warning lights flicker before?Battery, alternator or wiring.

Possible causes

Listed without ranking. Use the questions above to see which ones fit your car.

  1. Idle control faultStalls at stops.
  2. Crankshaft sensor failureSudden cut-outs, often when hot.
  3. Fuel pump or filterLoss of pressure.
  4. Air flow sensor or vacuum leakWrong mixture.
  5. Low system voltageElectronics reset.

Questions about Engine Stalls While Driving Or Idling

What should I do if the engine stalls while driving?

Keep steering, use firm pressure on the brake, put on hazard lights and get to a safe place before restarting.

Can a manual car stall because of the clutch?

Yes, driver technique is the most common reason in manual cars; a fault is likely if it stalls without clutch use.